82 gl1100 throttle bog


Information and questions on GL1100 Goldwings (1980-1983)
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professor squidbeard
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82 gl1100 throttle bog

Postby professor squidbeard » Thu Oct 09, 2014 3:16 pm



Hey there,

i've been reading some threads but haven't found any that have a solid fix. If i goose the throttle real hard it bogs down. if i roll it on, it's all fine. how can i resolve the throttle response? carbs are nice and clean, vacuum is hooked up. where should i be starting?



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WingAdmin
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: 82 gl1100 throttle bog

Postby WingAdmin » Thu Oct 09, 2014 3:27 pm

professor squidbeard wrote:Hey there,

i've been reading some threads but haven't found any that have a solid fix. If i goose the throttle real hard it bogs down. if i roll it on, it's all fine. how can i resolve the throttle response? carbs are nice and clean, vacuum is hooked up. where should i be starting?


Carburetors don't pump and spray gas into the incoming air like fuel injection systems, they depend on vacuum to suck the fuel up from the float bowls. This vacuum comes from two places:

- Venturi inside the carburetor
- Engine sucking air in against the resistance of the throttle plate (or slider, or whatever)

When you gradually open the throttle, the engine starts to accelerate, moving more air past the venturi (which generates more vacuum), and the engine requires more air, which means even as the throttle plate is opening, it is resisting the increased airflow (which generates vacuum). The increased vacuum pulls more fuel from the float bowl, keeping the fuel/air ratio correct.

However, when you quickly open the throttle, the engine is still running relatively slowly, and you have suddenly removed the restriction of the throttle plate. The vacuum drops down instantly, which means much less fuel is being pulled from the float bowl. This, along with a sudden inrush of air, causes an instant lean condition, and the engine "bogs down" - it doesn't have the correct fuel/air mixture.

To get around this problem, carburetor designers create an "accelerator pump." It is a little pump that when you open the throttle quickly, squirts a little bit of extra fuel into the neck of the venturi. This little bit of extra fuel makes up for the loss of fuel that normally occurs, keeps the fuel/air mixture ratio correct, and "gooses" the engine into quickly accelerating. The accelerating engine then pulls more air, which makes more vacuum, and balance is restored.

The problem is, unlike the normal jets, the accelerator pump jet only gets fuel going through it when you open the throttle quickly. So they tend to gum up sooner. The end result is restricted (or no) fuel flow through the accelerator pump jet, meaning its function is impaired - or negated.

It sounds like this is what has happened to your bike. You can try putting some carb cleaner in your tank and see if it will help over the next few tanks of gas, but chances are it will need to be pulled out and cleaned properly.

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RBGERSON
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had every year from 75 to 83

Re: 82 gl1100 throttle bog

Postby RBGERSON » Thu Oct 09, 2014 3:53 pm

I learn something new everyday..:)
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

professor squidbeard
Posts: 16
Joined: Sat Aug 23, 2014 7:02 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 82 goldwing gl1100 aspencade

Re: 82 gl1100 throttle bog

Postby professor squidbeard » Thu Oct 09, 2014 4:51 pm

awesome, i'll take that bit apart and clean it up real nice. I'll report back with fail/success.

Thanks!

professor squidbeard
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Re: 82 gl1100 throttle bog

Postby professor squidbeard » Thu Oct 09, 2014 5:04 pm

so, after looking into how to clean that part on the intertoobs, we have already done this when i cleaned the cabrs last and made sure fuel was passing through.

any other suggestions?

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WingAdmin
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Posts: 17046
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: 82 gl1100 throttle bog

Postby WingAdmin » Thu Oct 09, 2014 6:01 pm

professor squidbeard wrote:so, after looking into how to clean that part on the intertoobs, we have already done this when i cleaned the cabrs last and made sure fuel was passing through.

any other suggestions?


Can you see it squirting gas in when you open the throttle quickly?

professor squidbeard
Posts: 16
Joined: Sat Aug 23, 2014 7:02 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 82 goldwing gl1100 aspencade

Re: 82 gl1100 throttle bog

Postby professor squidbeard » Thu Oct 09, 2014 7:18 pm

yeah, it wasn't at first and we had to clean the hell out of it but it was free and clear before we put it on.

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virgilmobile
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Re: 82 gl1100 throttle bog

Postby virgilmobile » Fri Oct 10, 2014 8:36 am

Suggestion...
Remove the air cleaner..stick a angled mirror into the bottom of the plenum....get a good eyeball on the slide for each carb....start the bike and watch each slide as you rap the throttle from a idle...
Each one should jump the same amount...maybe half way up.....
They should move easily up and down....
Yes they can move easy with your finger and not move at all with air flow....
Should any one stick,moving up or down with air flow,it will cause a fuel mixture problem.

If all looks fine...
Have you synced the carbs.?
Does it rattle at 1200 rpm.?
At first start up,do all 4 cylinders fire equally..
8 second run from cold at 1000rpm , no revving,shut down,lightly tap each header...equally warm.?




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